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Topological phenomena have been a focus of physics and materials research where prominent effects emerge at systems¡¯ edge boundaries via the celebrated bulk-edge correspondence. Recently, with designed metamaterials, novel topological phenomena have been revealed at defects, unveiling a paradigm of bulk-defect correspondence. In this talk, I show via several examples that defects, with their rich geometry, can induce unique topological effects that have never been seen before. I will also go over briefly other important findings in this direction and give an overview of potential future developments. Studies in this direction open a new research frontier in topological physics and materials science, with cutting-edge physics and unprecedented phenomena as well as potential applications.

References:

Liu, Leung, Li, Lin, Tao, Poo*, Jiang*, Nature 589, 381-385 (2021).

Lin, Wu*, Jiang, Liu, Wu, Li*, Jiang*, Nature Materials 21, 430-437 (2022).

Lin, Wang, Liu, Xue, Zhang*, Chong*, Jiang*, Nature Review Physics (2023).